/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.catalina.ssi;

import javax.servlet.http.HttpServletRequest;
import org.apache.catalina.util.RequestUtil;

public class SSIServletRequestUtil {
	/**
	 * Return the relative path associated with this servlet. Taken from
	 * DefaultServlet.java. Perhaps this should be put in
	 * org.apache.catalina.util somewhere? Seems like it would be widely used.
	 * 
	 * @param request
	 *            The servlet request we are processing
	 */
	public static String getRelativePath(HttpServletRequest request) {
		// Are we being processed by a RequestDispatcher.include()?
		if (request.getAttribute("javax.servlet.include.request_uri") != null) {
			String result = (String) request
					.getAttribute("javax.servlet.include.path_info");
			if (result == null)
				result = (String) request
						.getAttribute("javax.servlet.include.servlet_path");
			if ((result == null) || (result.equals("")))
				result = "/";
			return (result);
		}
		// No, extract the desired path directly from the request
		String result = request.getPathInfo();
		if (result == null) {
			result = request.getServletPath();
		}
		if ((result == null) || (result.equals(""))) {
			result = "/";
		}
		return RequestUtil.normalize(result);
	}

	/**
	 * Return a context-relative path, beginning with a "/", that represents the
	 * canonical version of the specified path after ".." and "." elements are
	 * resolved out. If the specified path attempts to go outside the boundaries
	 * of the current context (i.e. too many ".." path elements are present),
	 * return <code>null</code> instead. This normalize should be the same as
	 * DefaultServlet.normalize, which is almost the same ( see source code
	 * below ) as RequestUtil.normalize. Do we need all this duplication?
	 * 
	 * @param path
	 *            Path to be normalized
	 * @deprecated
	 */
	public static String normalize(String path) {
		return RequestUtil.normalize(path);
	}
}